Gotchya. I do quite a bit of quarry & cave diving. The quarries are dark, murky & cold,... not much (any) current. The caves generally have currents, but are crystal clear & warmer (68- 72 degrees). I service my own equipment, as I am our shops repair tech,... I do make it a habit to at least get into a pool after servicing my stuff, before taking it on a serious dive. Then again with 17 regulators, 18 cylinders 5-6 BC’s of various types... :)